<template>
  <div>
    <div class="goods">
      <div class="menu-wrapper" ref="menuWrapper">
        <ul>
          <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex===index}" v-if="!item.foods.length == 0" @click="selectMenu(index,$event)">
            <span class="text border-1px">
              <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
            </span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper" ref="foodsWrapper">
        <ul>
          <li v-for="item in goods" class="food-list" ref="foodList">
            <h1 class="title" v-if="!item.foods.length == 0">{{item.name}}</h1>
            <ul>
              <!-- <li @click="selectFood(food,$event)" v-for="food in item.foods" class="food-item border-1px"> -->
              <li v-for="food in item.foods" class="food-item border-1px">
                <div class="icon">
                  <img width="57" height="57" :src="food.icon">
                </div>
                <div class="content">
                  <h2 class="name">{{food.name}}</h2>
                  <p class="desc">{{food.description}}</p>
                  <div class="extra">
                    <span class="count">月售{{food.sellCount}}份</span>
                  </div>
                  <div class="price">
                    <span class="now">{{food.price | price_change}}</span>
                    <span class="old" v-show="food.oldPrice">{{food.oldPrice | price_change}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <cartcontrol @add="addFood" :food="food"></cartcontrol>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <shopcart ref="shopcart" :selectFoods="selectFoods" :deliveryPrice="seller.deliveryprice" :minPrice="seller.minprice"></shopcart>
    </div>
    <food @add="addFood" :food="selectedFood" ref="food"></food>
  </div>
</template>

<script>
import BScroll from "better-scroll"
import shopcart from "components/shopcart/shopcart"
import cartcontrol from "components/cartcontrol/cartcontrol"
import food from "components/food/food"
import g from "../../common/js/http.js"
const response = require("../../common/data/goods.json")
const ERR_OK = 0

export default {
  props: {
    seller: {
      type: Object
    }
  },
  data() {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    }
  },
  filters: {
    price_change(val) {
      return parseInt(val) + "￥"
    }
  },

  computed: {
    currentIndex() {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let height2 = this.listHeight[i + 1]
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i
        }
      }
      return 0
    },
    selectFoods() {
      let foods = []
      this.goods.forEach(good => {
        good.foods.forEach(food => {
          if (food.count) {
            foods.push(food)
          }
        })
      })
      return foods
    }
  },
  created() {
    this.classMap = ["decrease", "discount", "special", "invoice", "guarantee"]

    // this.$http.get('/api/goods').then((response) => {
    //   response = response.body;
    //   if (response.errno === ERR_OK) {
    //     this.goods = response.data;
    //     this.$nextTick(() => {
    //       this._initScroll();
    //       this._calculateHeight();
    //     });
    //   }
    // });
    // if (response.errno === ERR_OK) {
    //   // console.log(response.data);
    //   this.goods = response.data
    //   console.log(response.data)
    //   this.$nextTick(() => {
    //     this._initScroll()
    //     this._calculateHeight()
    //   })
    // }
    this.getData()
  },

  methods: {
    getData() {
      var _this = this
      var user = localStorage.getItem("shopid")
      g.post_func("/api/v1/staff/get_menu_data", { user: user }, function(
        data
      ) {
        _this.goods = data.data
        console.log(data.data)
        _this.$nextTick(() => {
          _this._initScroll()
          _this._calculateHeight()
        })
      })
    },
    selectMenu(index, event) {
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodList
      let el = foodList[index]
      this.foodsScroll.scrollToElement(el, 300)
    },
    selectFood(food, event) {
      if (!event._constructed) {
        return
      }
      this.selectedFood = food
      this.$refs.food.show()
    },
    addFood(target) {
      this._drop(target)
    },
    _drop(target) {
      // 体验优化,异步执行下落动画
      this.$nextTick(() => {
        this.$refs.shopcart.drop(target)
      })
    },
    _initScroll() {
      this.meunScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      })

      this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
        click: true,
        probeType: 3
      })

      this.foodsScroll.on("scroll", pos => {
        this.scrollY = Math.abs(Math.round(pos.y))
      })
    },
    _calculateHeight() {
      let foodList = this.$refs.foodList
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    }
  },
  components: {
    shopcart,
    cartcontrol,
    food
  }
}
</script>

<style lang="stylus" rel="stylesheet/stylus">
@import '../../common/stylus/mixin.styl';

.goods {
  display: flex;
  position: absolute;
  top: 174px;
  bottom: 46px;
  width: 100%;
  overflow: hidden;

  .menu-wrapper {
    flex: 0 0 80px;
    width: 80px;
    background: #f3f5f7;

    .menu-item {
      display: table;
      height: 54px;
      width: 56px;
      padding: 0 12px;
      line-height: 14px;

      &.current {
        position: relative;
        z-index: 10;
        margin-top: -1px;
        background: #fff;
        font-weight: 700;

        .text {
          border-none();
        }
      }

      .icon {
        display: inline-block;
        vertical-align: top;
        width: 12px;
        height: 12px;
        margin-right: 2px;
        background-size: 12px 12px;
        background-repeat: no-repeat;

        &.decrease {
          bg-image('decrease_3');
        }

        &.discount {
          bg-image('discount_3');
        }

        &.guarantee {
          bg-image('guarantee_3');
        }

        &.invoice {
          bg-image('invoice_3');
        }

        &.special {
          bg-image('special_3');
        }
      }

      .text {
        display: table-cell;
        width: 56px;
        vertical-align: middle;
        border-1px(rgba(7, 17, 27, 0.1));
        font-size: 12px;
      }
    }
  }

  .foods-wrapper {
    flex: 1;

    .title {
      padding-left: 14px;
      height: 26px;
      line-height: 26px;
      border-left: 2px solid #d9dde1;
      font-size: 12px;
      color: rgb(147, 153, 159);
      background: #f3f5f7;
    }

    .food-item {
      display: flex;
      margin: 18px;
      padding-bottom: 18px;
      border-1px(rgba(7, 17, 27, 0.1));

      &:last-child {
        border-none();
        margin-bottom: 0;
      }

      .icon {
        flex: 0 0 57px;
        margin-right: 10px;
      }

      .content {
        flex: 1;

        .name {
          margin: 2px 0 8px 0;
          height: 14px;
          line-height: 14px;
          font-size: 14px;
          color: rgb(7, 17, 27);
        }

        .desc, .extra {
          line-height: 10px;
          font-size: 10px;
          color: rgb(147, 153, 159);
        }

        .desc {
          line-height: 12px;
          margin-bottom: 8px;
        }

        .extra {
          .count {
            margin-right: 12px;
          }
        }

        .price {
          font-weight: 700;
          line-height: 24px;

          .now {
            margin-right: 8px;
            font-size: 14px;
            color: rgb(240, 20, 20);
          }

          .old {
            text-decoration: line-through;
            font-size: 10px;
            color: rgb(147, 153, 159);
          }
        }

        .cartcontrol-wrapper {
          position: absolute;
          right: 0;
          bottom: 12px;
        }
      }
    }
  }
}
</style>
